Positioning Assistance Updates in RRC Inactive Mode
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Solution Overview
Problem
Existing wireless positioning systems face inefficiencies in updating positioning assistance configuration for terminal devices in RRC inactive mode, leading to unnecessary resource usage and latency due to broadcast methods, and requiring active mode transitions for unicast updates.
Innovation Solution
A mechanism for terminal devices in RRC inactive mode to request and receive updated positioning assistance data through improved random access procedures, allowing direct or indirect communication with a location server to maintain power savings while updating configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broadcast method is used to update positioning assistance configuration, then all terminal devices can receive updates, but resource overhead and latency increase unnecessarily
Solution Approach 1:
The patent extracts the update mechanism from the broadcast approach and implements it through unicast signaling specifically for terminal devices in RRC inactive mode. The location server sends positioning assistance data updates directly to the terminal device via the serving network device, eliminating unnecessary broadcast overhead while maintaining reliable delivery to targeted devices.
2Loss of energy
If unicast method is used to update positioning assistance configuration, then resource usage is efficient, but terminal device must transition to active mode increasing latency
Solution Approach 1:
The patent applies preliminary action by pre-configuring the terminal device with positioning assistance data before it enters RRC inactive mode. The network device stores the updated positioning assistance data and enables the terminal to receive updates while remaining in inactive mode, eliminating the need for mode transition and associated latency.
3Use of energy by moving object
If terminal device remains in RRC inactive mode, then power savings are maintained, but configuration updates cannot be delivered timely
Solution Approach 1:
The patent introduces the serving network device as an intermediary that bridges the location server and the terminal device in RRC inactive mode. The serving network device receives positioning assistance data from the location server and delivers it to the terminal device while the terminal remains in inactive mode, enabling timely updates without power mode transitions.
Data Source
AI summary
Embodiments of the present disclosure relate to updating positioning assistance configuration. A first device transmits a first request for updating a current positioning assistance configuration of the first device to a second device. The first device is in a radio resource control inactive mode, and the current positioning assistance configuration is used by the first device to receive a plurality of positioning reference signals from a plurality of positioning devices. Further, the first device receives a first response comprising a requested positioning assistance data for updating the current positioning assistance configuration from the second device. In this way, the first device can maintain being in a power saving mode meanwhile update the positioning assistance configuration in time.